I reload all my empties, those that are "shot out" go home and into the garbage. Hitting a primer may set it off but the result would be a non-issue. A cartridge needs to be in a chamber to build up the pressure needed to attain hazardous velocities. Federal Cartridge and the Fridley, MN Fire Dept did a test of this back in the '70s and it has been replicated by several other organizations since.